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Compiler/AWR1642: Could BPM MIMO waveform detect target 0 deg?

Katie
Prodigy 120 points
Part Number: AWR1642

Tool/software: TI C/C++ Compiler

Hi all,

    Now we are using awr1642's new SDK. We would like to use the BPM waveform. But we are not sure if the BPM waveform can detect target at 0 deg? Because if Tx1 and Tx2 have a phase difference of 180deg， the far field energy in 0 deg is zero. Which means no reflected signal can be received from 0 deg target. But target at 0 deg is very important, so is BPM useable?

  • 0
    TI__Guru*** 148804 points
    Hi,

    This looks like a more advanced question. We need to check with our systems team and get back to you

    thank you
    Cesar
  • 0
    TI__Expert 5235 points
    In the SDK's oob demo, we support BPM-MIMO scheme described in section "BPM-MIMO" in www.ti.com/.../swra554.pdf. As seen in this scheme, tx1 and tx2 transmit in phase in even chirps and in opposite phase in odd chirps. In the receive processing the tx1 and tx2 contributions are retrieved by performing the basic math as indicated in the application note [more details of this processing you can see in the doxygen documentation of the oob demo in the SDK]. The chirps in which tx1 and tx2 are transmitting in phase will have energy at 0 deg, so energy is not lost at 0 deg and it can detect the objects at 0 deg. For the BPM-MIMO scheme referred here, there is nothing special about 0 deg.
  • 0 in reply to Piyush_
    Prodigy 120 points

    Hi Piyush，

        Thanks a lot for your reply. This solved my question.